title: Retrieval analysis of posterior stabilized polyethylene tibial inserts and its clinical relevance.
abstract: This was a retrieval analysis of 83 PS inserts to assess the effect of limb alignment, implant position and joint line position on the pattern of wear in posterior stabilized (PS) tibial inserts. The total damage score was significantly higher in knees with postoperative varus alignment more than 3° (P = 0.03). The total damage score to the post was significantly more in knees with joint line elevation more than 5 mm (9.7 ± 3.9, compared to 6.5 ± 3.7 in knees with less joint line elevation) (P = 0.05). Limb malalignment and joint line elevation resulted in more damage in PS inserts. An external rotation subluxation damage pattern was found in joint line elevation.
authors.affiliation: Division of Orthopaedic Surgery, London Health Sciences Centre, Ontario, Canada.
authors.forename: Hee-Nee
authors.initials: HN
authors.lastname: Pang
authors.affiliation: Division of Orthopaedic Surgery, London Health Sciences Centre, Ontario, Canada.
authors.forename: Paul
authors.initials: P
authors.lastname: Jamieson
authors.affiliation: Division of Orthopaedic Surgery, London Health Sciences Centre, Ontario, Canada.
authors.forename: Matthew G
authors.initials: MG
authors.lastname: Teeter
authors.affiliation: Division of Orthopaedic Surgery, London Health Sciences Centre, Ontario, Canada.
authors.forename: Richard W
authors.initials: RW
authors.lastname: McCalden
authors.affiliation: Division of Orthopaedic Surgery, London Health Sciences Centre, Ontario, Canada.
authors.forename: Douglas D R
authors.initials: DD
authors.lastname: Naudie
authors.affiliation: Division of Orthopaedic Surgery, London Health Sciences Centre, Ontario, Canada.
authors.forename: Steven J
authors.initials: SJ
authors.lastname: MacDonald
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D019645:Arthroplasty, Replacement, Knee / Q000009:adverse effects / Q000295:instrumentation*; D001672:Biocompatible Materials; D001696:Biomechanical Phenomena; D020878:Device Removal; D019544:Equipment Failure Analysis; D005260:Female; D006801:Humans; D007719:Knee Joint / Q000601:surgery*; D007720:Knee Prosthesis / Q000009:adverse effects*; D008297:Male; D008875:Middle Aged; D020959:Polyethylene; D011474:Prosthesis Design; D011475:Prosthesis Failure; D011859:Radiography; D012086:Reoperation; D013977:Tibia / Q000000981:diagnostic imaging / Q000601:surgery*
chemical_list: D001672:Biocompatible Materials; D020959:Polyethylene
keywords: arthroplasty; damage; knee; posterior stabilized